Safety-valve.



L. W. HENRY.

SAFETY VALVE. APPLICATION FILED-JAN. 22, 1913.

LAWRENCE W. HENRY, OIE BUFFALO, NEW YORK.

SAFETY-VALVE.

Specification of Letters Patent.

Patented May 19, 1914.

Application filed January 22, 1913. Serial No. 743,578.

To all whom it may concern:

Be it known that I, LAWRENCE W. HENRY, a citizen of the United States, residing at Buffalo, in the county of Erie, State of New York, have invented certain new and useful Improvements in Safety-Valves; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention is directed to improvements in safety valves for gas burners, and has for its object to provide a device of this character so constructed that should the pressure of gas in the main decrease the valve will operate to cut oif the flow of gas.

A further object of the invent-ion is to so construct a valve of this character that after the valve is operated to. cut off the supply the same is held positively seated, and can be only released manually.

With these and other objects in view, this invention resides in the novel features of construction, formation, combinations and arrangements of parts to be hereinafter more fully described, claimed and illustrated in the accompanying drawing, in which Figure 1 is a side elevation of the device. Fig. 2 is a longitudinal sectional View through the same. Fig. 3 is a sectional view on line 3-3 of Fig. 1. Fig. 4 is a similar view on line 4 -4: of Fig. 1.

Referring to the drawing, the numeral 1 designates a casing, said casing having connected to one end an inlet pipe 2, and to the other end an outlet pipe 3 which supports the usual gas burner and is provided with a cutoif valve 1 which is of the usual construction.

The casing 1 is formed with a valve seat 5 upon which is adapted to seat the tapered valve plug 6, said plug having the rounded end 7 which is provided with a shoulder 8. Formed integral with the rounded end of the plug 6 is a stem 9, said stem being rectangular in cross section and is adapted to slide in the guide strip 10 which is supported vertically within the outlet pipe 3. Surrounding the stem 9 is a coil spring 11, the tension of which is regulated so that the usual gas pressure will hold the plug 6 from engagement with the valve seat 5, but should the pressure be reduced the spring will force the plug into engagement with the seat.

Connected to the under surface of the easing 1 is a tubular extension 12 in which operates the pin 13. Mounted in the extension 12 is a coil spring 14:, the upper end of which is connected to the pin 13 so as to hold one end thereof projected into the casing 1, the lower end of said spring being supported upon the cap 15 which is carried by the extension 12.

The gas pressure normally holds the valve stem unseated, at which time the inner end of the pin engages the plug, but should the gas fall below the predetermined pressure the spring 11 will force the plug into engagement with the seat 5, during which operation the inner end of the pin will pass over the rounded end of the plug and into engagement with the shoulder 8 and will be held thus by the spring 14. Thus it will be seen that should the gas again reach the normal pressure the plug will be held positively seated, thereby preventing gas from entering the room through the burner. It is obvious that when it is desired to again light the burner it is only necessary to remove the pin 13 from engagement with the shoulder 8, after which the gas will unseat the plug 6.

What is claimed is:-

An automatic cut-oif comprising a valve casing, an egg-shaped spring pressed valve in said casing normally held open by gas pressure, there being a notch in one side of said valve, and a spring pressed pin bearing against the rounded exterior of said valve and being constantly kept under slight motion by yielding of the valve under varying gas pressure, and being adapted to seat in said notch upon closing of said valve whereby to positively hold said valve seated until said pin is manually released.

In testimony whereof, I afiix my signature, in the presence of two witnesses.

LAWRENCE W. HENRY.

Witnesses:

WILLIAM L. HENRY, ALBERT A. WEBER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

